JP2606388Y2 - Planetary gear set - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a compact type planetary gear apparatus in which an input shaft and an output shaft can be coaxially arranged. The feature is that it can be made unnecessary.

[0002]

2. Description of the Related Art A conventional planetary gear apparatus of this type is disclosed, for example, in Japanese Utility Model Laid-Open No. 1-1458, filed by the present applicant.

[0003]

The above-mentioned conventional planetary gear device is excellent in that the input shaft and the output shaft can be coaxially arranged and the body can be made compact.
Since it was not a sealed type, it needed to be lubricated and was not suitable for use where oil leakage should not occur.

[0004] Therefore, the development of a planetary gear device in which the body can be made compact, the input shaft and the output shaft can be coaxial, and the need for lubrication can be eliminated is solved. Had to be a challenge.

[0005]

In order to achieve the above object, the present invention provides a sun gear, a planetary gear meshing with the sun gear, and an internal gear provided on the same axis as the sun gear and meshing with the planetary gear. A planetary gear device having a planetary gear shaft rotatably bearing a planetary gear, and a rotating body rotatably provided with respect to the sun gear shaft, wherein the internal gears have the same shape as each other. It comprises a pair of front and rear fixed gear members and a rotating gear member each having teeth and meshing with the planetary gears, and having inner end faces axially opposed to each other, and the rotating body has a shaft that sandwiches the planetary gears from front and rear. A pair of front and rear rotating bodies opposing each other in the direction, and the pair of front and rear rotating bodies are fitted with a space holding stepped portion in which each of the planetary gear shafts is fitted into a stop shaft hole and penetrated by both rotating bodies. Connect the shaft ends of the connecting pins Affixed to the outer end face, mounted an oil-sealed bearing for the inner peripheral bearing between the sun gear shaft, and mounted an oil-sealed bearing for the outer peripheral bearing between the fixed gear member and the rotating gear member. It is intended to provide a planetary gear device characterized by the above.

[0006]

[Action]

The gear device according to the present invention includes an internal gear having a pair of front and rear fixed gear members and a rotating gear member having internal gears of the same shape, meshing with planet gears, and having inner end faces axially opposed to each other. , The axis of the rotating gear member coincides with the axis of the sun gear shaft, and the input and output axes can be coaxial. Further, the rotating body that rotatably supports the planetary gear is constituted by a pair of front and rear rotating bodies in which the planetary gear shaft is fitted into a stop shaft hole, and the planetary gear is opposed to each other in the axial direction with the planetary gear interposed therebetween. Since the distance between the pair of front and rear rotating bodies is held by fixing the connecting pin provided with the spacing step provided between the two rotating bodies, the body is formed compact. Furthermore, since a bearing with an oil seal for the inner peripheral bearing was mounted between the sun gear shaft and both rotating bodies, and a bearing with an oil seal for the outer peripheral bearing was mounted between the fixed gear member and the rotating gear member. The gears meshing with each other have good sealing properties, and the shafts of the sun gear shaft, the planetary gear shaft and the internal gear have no runout and transmit rotation smoothly. The present invention eliminates the disadvantages of the conventional device as described above.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a sun gear shaft provided with a shaft coupling 2 on one side (left side in the figure) of the body to transmit rotation, 3 denotes a sun gear integrated with the sun gear shaft 1 and 4 denotes a sun gear 3 and teeth. The planetary gears 5 meshing with the same length have the same axis as the sun gear shaft 1 and the internal gears meshing with the same tooth length as the planetary gear 4, and 6 and 6 ′ are the sun gear 3 and the planetary gear 4. The two ends of the planetary gear shaft 7 that rotatably bears the planetary gear 4 via the needle bearing 21 are provided at the shaft holes 2 with a stop.
2 are a pair of disk-shaped front and rear rotating bodies which are provided in the axial direction so as to be integrally rotated with the revolving of the planetary gear 4.

The internal gear 5 has internal teeth 8, 8 'having the same shape as each other.
And a pair of front and rear fixed gear members 9 and rotary gear members 10 which mesh with the planetary gears 4 and whose inner end faces are opposed to each other in the axial direction. As shown in FIG. 2, the pair of front and rear rotating bodies 6 and 6 ′ are respectively connected to the through holes 11 arranged at intervals in the circumferential direction.
2, the spacing step 13 formed on each connecting pin 12 is brought into contact with the inner surface of the rotating body 6, 6 ′, and the shaft end protruding from the outer end surface is fixed by caulking from the outside to fix the sun. The gear 2, the planetary gear 4, and the internal gear 4 are firmly connected to each other with an interval substantially equal to the tooth length of the gear, so that the rotation accuracy between the input and output shafts can be kept good.

Further, the pair of front and rear rotating bodies 6, 6 'is
As shown in the figure, the sun gear shaft 1 is provided with an oil seal bearing 15 for the inner peripheral bearing by providing stepped portions 14 facing each other on the inner peripheral surface where both ends of the sun gear shaft 1 are fitted. An oil seal bearing 18 for an outer peripheral bearing is mounted between a step 16 provided on the outer periphery and a step 17 provided on the fixed gear member 9 and the rotating gear member 10, respectively. The fixed gear member 9 and the rotating gear member 10 are bearinged to enhance the oil sealing properties of the gear portions that mesh with each other. Reference numeral 23 in the figure denotes a lubrication hole with a screw stopper provided on the rotating body 6 and is used for replenishing the oil sealed in the rotating bodies 6 and 6 'when the oil has deteriorated. In implementing the present invention, a thrust radial bearing or a cross roller bearing may be used as the bearings 15 and 18 for the inner and outer peripheral bearings. Further, the fixing of the shaft end of the connecting pin 12 to both the rotating bodies 6 and 6 'is not limited to the caulking, but may be a screwing.

In this planetary gear device configured as described above, for example, a body is fixed using a screw hole 19 provided on the outer side surface of the fixed gear member 9, and a screw provided on the outer side surface of the rotary gear member 10 is provided. It is used to connect the output shafts using the holes 20. In some cases, the fixed gear member 9 and the rotating gear member 10 are used in the opposite manner, and the fixed gear member 9 is used as the output shaft side.

[0012]

As described above, according to the present invention, an internal gear is constituted by a pair of front and rear fixed gear members and a rotating gear member whose inner end faces are axially opposed to each other, one of which is fixed and the other is fixed. Is used for rotational transmission, so that the axis of the rotating gear member and the axis of the sun gear shaft coincide, and the input and output axes can be coaxial. Further, the rotating body that rotatably supports the planetary gear is constituted by a pair of front and rear rotating bodies in which the planetary gear shaft is fitted into a stop shaft hole, and the planetary gear is opposed to each other in the axial direction with the planetary gear interposed therebetween. Since the distance between the pair of front and rear rotating bodies is held by fixing a connection pin with a spacing holding step provided between the two rotating bodies, the body is formed compact and connected via the both rotating bodies. It is suitable for use, for example, in control devices of automobiles, because the center accuracy of the planetary gear device is improved and the durability is excellent.

Further, a bearing with an oil seal for the inner peripheral bearing is mounted between the sun gear shaft and the two rotating bodies, and a bearing with an oil seal for the outer peripheral bearing is provided between the fixed gear member and the rotating gear member. Since it is mounted, the sealability of the gear portions meshing with each other is good, and in combination with the configuration of the pair of front and rear rotating bodies that are firmly held at an interval between each other by fixing the connection pin with the interval holding step portion, the sun Since the shafts of the gear shaft, the planetary gear shaft and the internal gear have no runout and the rotation is smoothly transmitted, they are widely used particularly as planetary gear devices for precision equipment. The present invention has excellent practical effects as described above.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention.

FIG. 2 is a front view, partially cut away, of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sun gear shaft 2 Shaft coupling 3 Sun gear 4 Planetary gear 5 Internal gear 6 Rotating body 6 'Rotating body 7 Planetary gear shaft 8 Internal tooth 8' Internal tooth 9 Fixed gear member 10 Rotating gear member 11 Through hole 12 Connecting pin 13 Spacing section 14 Step section 15 Bearing with oil seal for inner peripheral bearing 16 Step section 17 Step section 18 Bearing with oil seal for outer peripheral bearing 19 Screw hole 20 Screw hole 21 Needle bearing 22 Shaft hole 23 Oil hole with screw plug

Claims (2)

(57) [Scope of request for utility model registration] 1. A sun gear 3, a planetary gear 4 meshing with the sun gear 3, an internal gear 5 provided on the same axis as the sun gear shaft 1 and meshing with the planetary gear 4, and a rotatable planetary gear 4. In a planetary gear device comprising a rotating body rotatably provided with respect to the sun gear shaft 1 with the planetary gear shaft 7 bearing the bearing, the internal gear 5 has internal teeth 8, 8 of the same shape as each other. With the planetary gear 4 respectively,
The rotating body comprises a pair of front and rear fixed gear members 9 and rotating gear members 10 whose inner end faces are axially opposed to each other. The pair of front and rear rotating bodies 6 and 6 ′ are fitted with the shaft ends of the planetary gear shaft 7 in the stop shaft holes 22, respectively. The shaft ends of the connection pins 12 with the spacing stepped portions 13 penetrated are fixed to the respective outer end surfaces, and a bearing 15 with an oil seal for an inner peripheral bearing is mounted between the sun pin 1 and the sun gear shaft 1. A planetary gear device comprising an oil seal bearing for outer peripheral bearing mounted between a fixed gear member and a rotary gear member. 2. The pair of front and rear fixed gear members 9 and rotary gear members 10 have screw holes 19, 20 on their outer side surfaces.
The screw hole 19 of one rotating body 6 is used for fixing, and the screw hole 20 of the other rotating body 6 'is used for rotation transmission. 2. The planetary gear set according to claim 1.